The length of the character conversion table specified on the OMVS command is incorrect. The OMVS command requires tables of a certain length. If the CONVERT keyword was used to override the default character conversion table name, the specified name is probably not the name of a character conversion table. If the specified name is correct, the table was probably not built correctly.
The OMVS command ends and returns to TSO/E, without starting a shell session.
Make sure that all character conversion tables for the OMVS command are exactly the required length. If this error message appeared when the CONVERT keyword was not specified on the OMVS command, make sure the default table is the correct length.
If the CONVERT keyword on the OMVS command was used to override the default character conversion table, make sure that the specified data set really is a character conversion table, or use the CONVERT keyword to choose a different table. If the CONVERT keyword was not used, contact the system programmer.